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Re: Iterating through all IP addresses in a CIDR

by BrowserUk (Patriarch)
on Nov 04, 2003 at 16:22 UTC ( #304461=note: print w/replies, xml ) Need Help??


in reply to Iterating through all IP addresses in a CIDR

Only deals with IPv4.. but extending it wouldn't be hard.

#! perl -slw use strict; our $M ||= 30; our $IP ||= '1.2.3.4'; sub bin2dd{ join '.', unpack 'C4', pack 'N', $_[0] } sub dd2bin{ unpack 'N', pack'C4', split'\.', $_[0] } sub CIDRList{ my $iter = 0xffffffff >> $_[0]; my $mask = ~$iter; my $lo = dd2bin( $_[1] ) & $mask; map{ bin2dd $lo++ } 0 .. $iter; } print for CIDRList $M, $IP; __END__ P:\test>CIDR -M=28 -IP=64.96.128.0 64.96.128.0 64.96.128.1 64.96.128.2 64.96.128.3 64.96.128.4 64.96.128.5 64.96.128.6 64.96.128.7 64.96.128.8 64.96.128.9 64.96.128.10 64.96.128.11 64.96.128.12 64.96.128.13 64.96.128.14 64.96.128.15

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